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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f55b479ca708210cfa203d297ea96ffe322d18b2ec8bd2f758499e66b0a9e3' 
  AND token = 'zrM9DXJGl7cPSVV7mrnGHQx1cleKdCz4Tdx9ndTLc4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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