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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30cf5dcdb2c7805c6429b7980207419c3c1305ed826e235941505cdaaa409b94' 
  AND token = 'VnclTDZybvRPOELWSMjqFgs4eBHScJYpYGPRRm61pqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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