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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62bf54e24f1a888de477b2a9efe1c5701fcfafaf6396f0a48dbf6415a4d1eef6' 
  AND token = 'QM6DQS4a/AXodp9xaZbkHTQg7us+Ms/O/gW0QMQnTug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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