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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02aa7ec1cbc36a49e908da0266ffb245198dca438ea60eaa61a890479b395ce' 
  AND token = 'nxy84rjPasWYj1TMGXsZ5U8BtLkc0sQo8bxgszTbQVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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