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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1755fe197ed2babbf36e68babbafd8cdbbbe6a477a9b0a45afdb0fee8eef072' 
  AND token = 'X1xel/dYcKHXbcPzxuQi+awZh4aa/ku9wN56EyFhKXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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