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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45af6c7404b5160be66bd6de7000a0dcabc3b84669ec8fbc32affe19f8679093' 
  AND token = '1lCwi839awcqRZ4HzNDe8IHeiPz4y5ELz9mt//u4780=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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