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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd213ecf845999115a7661624d98cc958281a65b60b38de951c2eb436312204c7' 
  AND token = '7FoRQL7ltNc3A9Z4fRa1fFSRPXR11Z9MKJbNNErEiPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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