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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1d1743c600c8976cfe37223668551c862ea6bd816f4d354b75e83c6fef9080' 
  AND token = 'PODV23r0uL2YOcuKre1Myc+ta5+inMc1LjxfLYQxgxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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