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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a60a8355ebdab84acb18ebd73e1cffd66506ff2f6c00cb9085a7398f116d4e' 
  AND token = 'k/wBYdfVbOtJL1HEQCminJtskNCyw6TrqHOIyBGu+u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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