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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feffa3937678b43e2ca1780ff800cb389b715ee8978970b58474b3a7ebcd2554' 
  AND token = '4o5mtPDf02kjrjdxdfBnh5JcALg9PfK5LJDt59d8TXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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