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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a6b3a10eb5762df056ef8019979cc90ec02b4261a4c6ba26ab9dbd9ecfad684' 
  AND token = 'IeL9TltQuiAnfio4kSxsqzcdj1L9MuBX+zmSRBB7drM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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