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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a5a7364b0695033e19ecb8b6e68103bed0ab3d54b5d56cf31302a52b277aaa' 
  AND token = 'EbMMTtj2wJR7uRzgIDm8IDjf+uEbXwOJiPGov4wSeBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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