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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e8af896364279dda6ab360ee51016314d5bb25d47ccd6bbcaf8028cb368fcd3' 
  AND token = '6kQlc57wxa5kHIbm4z5g1uyYupmhQ2NRHcA7x+vx5ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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