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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdea95a3ef44d5237de93b27a5ef6935b2ea0ccb2f230aa05c311d8b9f7888aa' 
  AND token = 'A2cjS4YnKDM1WVxxpg3nzzKL/e1x1sGWfOZ9ueYmaGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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