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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b284417df20682052dad9d7cfc7ab337e5795b751c46ecc5e5414c77f94a18bc' 
  AND token = '49lvjQvOyROBb2e0unEGui6Wtzthlvrivu4/GP3bu1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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