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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e9011a1f7bbbfc5def4c97fa98a1efea7f2880076caeca8b97f7958cb251391' 
  AND token = 'OXRUfkKcF7j126o0k2HdRmWfHLM7t8HCiky+Fu/PW/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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