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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb98df8d3eaa0aa343320cc3841243f72e84d203e711a4cd1f3463feeff3741' 
  AND token = 'cVc+nLLEHaDGOqZagLuoRqPThdN7RsgYfoNwU4eqH0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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