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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e959723994e5b40feb59af9835536fda2cfb3682a3021372f683de6e83274dae' 
  AND token = 'q5qWG+r0WYD0gasraNU4EKdhiyjB28U5ilu/Embr+kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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