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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f5e44b22fd4d29f88118067a90d1f29f1a83a527bc365792d71c3b3df8934c' 
  AND token = '84ku71wdXdWc72j97Jjjta+kOhldHgM3PLwwSik22IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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