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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3eb3be12fca132ecd973b98ea0b9b3f33f2c34ad59af20fa609429ccfd6d2a0' 
  AND token = '6Pt9XjSydNezZhTqt2Yf5v75ZnWBTPFI274pcfcjLm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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