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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '726b3cd1a278203a9644c7c0361589688a0757e40f7b3503073e9d601eedb24a' 
  AND token = 'K1lvYX1q2+PQG8NyqI6iII5o28BstQMTrm6rgDmoL0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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