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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41851ae28802080724ad123f60ab4f491698efcca7cb472f4e2c0c3401c1443e' 
  AND token = '6r+d1r0fAT/ZqVb21kBWyqn3szgCaZpW+6rjQzTGaIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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