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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd961a588f60c4f6e1b46a2f352fcdbf9ebfa8431c22a9d2e46ee63a8f98430eb' 
  AND token = 'tCNsgJ6Nz1KOXHcGQU3AFgscgovPxKukzLiI4B+LHR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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