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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038c376c2429d6b6b3de014ed91f0d2f5e546930ed2baeec74e07c4add844a6a' 
  AND token = 'Ewc3lHzuZGq0rnOOjPLH2SuOgcszqf0dC/Hb0zfiHII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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