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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ec9e4cfa260f360f05e9588664fac06153deba3af98cba03215a2e8dc41b0b' 
  AND token = 'P+6alcXMaACeS6IBZ2623LCUay/tTgP1nc4sqqV7i2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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