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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8414cc07cb6f6861b84c5c9459dca9004fb34a9b494797538c7ab653063b75d' 
  AND token = '2s8LstJrHhvO6zS9FPf6OAM3x6rQ6F+NPRaO5WtVyd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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