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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1fbde6c9fd230eebc1f554c737206ef7de73020946baa0a7bb7a21919e0c54e' 
  AND token = 'GzZav7SY2aW5MV2ynGPdbntffsdQJ2NPPDmRKn5CYVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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