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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb40caf2673761c6283772fc02e953090c46696cb86b2f5426427d6493f20b7' 
  AND token = 'fICRlNHZG01BPufwU9sOY1GVQai9Ewjv5XcNAo+YLMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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