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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f08ef3892936022d6bf62a8d1a9334520e850d4f2c54bec538da4111887b5d' 
  AND token = 'dAw92rcBHBHkBl3B0xau+8rwyiZ+N8xpqeOL9MEc+84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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