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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dedebc115f7459b1e0d209b00ad05e13233eb91ce1e8e7e628200319d4562bdc' 
  AND token = 'D2lVTfaE5qzoOyjNsJ4UcwvQUAso+B3TAiT9djv/enQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}