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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e47391359ac048ebf250681b24b6c28ab843ed0974d37f6541d1edb6911f5f' 
  AND token = '7w3oRLg+aaYrRdf5YF4gR2PHBuPqneloAgP3ObwT2w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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