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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b7758363832e1016142c99e6145a51a85a0dff6ab85377c5679d2738b7b837' 
  AND token = 'FVI6vD5myM6ikMHv8W35m1a/tTd8bCdEYUNiZX2cEQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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