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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75782c04c9187b3bfdb837935e329ae50391d75aad31de248de96793e4c79971' 
  AND token = '95cNI3xh1hNJLVv4hVUHm7yX+V6Ef2HLGTVdgXrbdDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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