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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb55b56b60fb2b81b850b3e2c2a0142be12125fb8d218bd89f49cf790accb775' 
  AND token = 'wmSQSg8JTmhWZyKnHhFzr9nxhmPsfxANRVYFtR7FovU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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