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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec601044b6ad8ff4b4d0ba4dc27294e24d3b2d5d87146ae43b71d6807bedb11b' 
  AND token = 'Rk3KKiFgY7sW2nj1TsaPcCEspTEKCZ4B/xH2zBn/Baw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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