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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1760c40d1410a0b56968f6012e59fa90413056499c2e3d79c5cc02cedb3bbc45' 
  AND token = '4tAZeJri+wdQI2pHShUauqQWuQ4TSVzNWPLqBRQ2G50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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