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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2494e00dca1beefb131c9174d0c0affe21f2174145965412a2f935b181ca611' 
  AND token = 'qMF/eySisUETigZ3OrKXwAMs5Xk5DvQ3msW5FjDBAk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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