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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2030bee190bb68ba43f510d5d4e715327dcdeed304900c23deddaf7e4d46db87' 
  AND token = '6zvBJASlX90KKrTCWGRa4fSxXBNOzqibNF+VkAkpCRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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