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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ce9c4b4e2664cd1c6e8a925e9ebf77e3711912d86fe6c6e29fb1ba227fda8f' 
  AND token = 'eUuZ0F6tTkuOzQ7MBPBCzPStnkq4YM6ocA6+iOrW9/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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