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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13d0274860029fb6ce014ca67d61dfa642d1cfb2bb26d9119688a5e957a7cc8' 
  AND token = 'v4TKsAdRqAKCqszOy2D/cA5I3Dmckookv9eQJtUGJJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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