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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1880f24345c86f1b7d01346bc806d504f024def9cd99e504dfb56a5087e62ae2' 
  AND token = 'q96+b93S5im/qoDTcj0vimcCYUon24JbazdqqLCYWnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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