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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1a6e17212614727a935a1cfacaa2409af0f07a91b1ccc94532acce147ba4b6' 
  AND token = 'ELmuq2opuLavNJ44aXqHEpMb3ze87wjatNsnViYCGtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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