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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f2a296782228b52db600992312e6346d19c7927aff79f6fe236c6d0e42ebb1' 
  AND token = 'hRMxOArpyuI9nIUapvuQuIWbQ3wRkD5Ss2/ZFTME4Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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