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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4da373c34ddc07611a33a1988fbb1fc57e7a2c470cc3e83491ed1f2a3a7c1bc' 
  AND token = 'SdRcMv/Dmr/V9Pet5WQYbNAP/uuBQOs7g0AWWI3Fj8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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