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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ab92adf3969765c91c5c331f6096552a53f7b24cd31adb7b25ca9cbd861d7c' 
  AND token = 'R8vJf6iLcb+zjoxUasRQwek/Nxu/TTry8wHLzj3FP+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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