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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d6c08ad6d5c637770ed2b5e4cc7886b6672143c0bfd45478266064181f7a2b' 
  AND token = '4bcJtt/yB+EVXlxL2mkBabgKWMKdWj3TYbt2/v0xmo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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