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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9e7d138955a1d927c2351ddffa9a234409059227b17a569d26d0c60838b268' 
  AND token = '0SDCUlO1Zff2JPcQEp4P8+tn+n6UkcyZCTVxuKTu6F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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